Localized plasmon-engineered spontaneous emission of CdSe/ZnS nanocrystals closely-packed in the proximity of Ag nanoisland films for controlling emission linewidth, peak, and intensity

Abstract

Abstract:Using metallic nanoislands, we demonstrate the localized plasmonic control and modification of the spontaneous emission from closely-packed nanocrystal emitters, leading to significant changes in their collective emission characteristics tuned spectrally and spatially by plasmon coupling. Using randomly-distributed silver nanoislands, we show that the emission linewidth of proximal CdSe/ZnS core-shell quantum dots is reduced by 22% and their peak emission wavelength is shifted by 14nm, while their ensemble photoluminescence is enhanced via radiative energy transfer by 21.6 and 15.1 times compared to the control groups of CdSe/ZnS nanocrystals with identical nano-silver but no dielectric spacer and the same nanocrystals alone, respectively.

Tuning the optical emission of MoS2 nanosheets using proximal photoswitchable azobenzene molecules

“…The enhancement or the quenching of the PL emission of the active material can be dictated by the distance between the active material and the metal grains, 13,29 which is usually optimal at 10 nm for PL enhancement. 13,30,31 On the other hand, an additional recognized plasmonic effect is the PL red-shift when the emitter and the metal grains are too close (below 10 nm), which can be explained as a dipole-dipole interaction between the emitter and the metal grain. 31,32 PL spectra recorded from the sample MoS 2 -mSAM and MoS 2 -mSAM-Cl (red spectra) are presented in Figs.…”

“…13,30,31 On the other hand, an additional recognized plasmonic effect is the PL red-shift when the emitter and the metal grains are too close (below 10 nm), which can be explained as a dipole-dipole interaction between the emitter and the metal grain. 31,32 PL spectra recorded from the sample MoS 2 -mSAM and MoS 2 -mSAM-Cl (red spectra) are presented in Figs. 3(a) and 3(b), showing clearly the impact that the two types of azobenzene molecules have on the 2D crystal.…”

Onion-like (CdSe)ZnS/CdSe/ZnS quantum-dot-quantum-well heteronanocrystals for investigation of multi-color emission

“…Among the examples of such quantum confined structures are semiconductor nanocrystal quantum dots that exhibit size-tunable optical and electronic properties because of their exciton confinement [1][2][3]. Thanks to these adjustable features, nanocrystal emitters have attracted great attention for different device applications [4][5][6][7][8][9][10][11][12][13]. Today various core-shell nanocrystal structures (e.g., in CdSe-ZnS and CdSe-CdS material systems) are commonly synthesized in high-boiling organic solvents [14][15][16].…”

White light generating semiconductor nanocrystal luminophors with high photometric quality

“…metallic nanoislands that are carefully tuned both spectrally and spatially [4]. As a result of the plasmon coupling, we 400 450 500 550 600 650 700 modified the emission linewidth of these nanocrystals, wavelength (nm) shifted their peak emission wavelength, and enhanced their nanocrystal emitters, exhibiting such significant emission linewidth and peak modifications, along with high emission III.…”